1. Colthup NB (1950) J Opt Soc Am 40:397
2. Charitonow JJ, Olejnik II, Knjasewa NA, Kolomnikow IS (1982) Koordinseionnaja chimija 8:1285
3. Charitonow JJ, Olejnik II, Knjasewa NA (1983) Zurnal neorganiceskoj chimii 28:844
4. Vand V, v. Aitken A, Campbell RK (1949) Acta Cryst 2:398
5. Kitaigorodski AJ (1978) Molek�lkristalle, Berlin